Bio:

He can identify the treasures stolen from the Hall of Great Valor on sight (they’ve been his responsibility for years).

Sertanian recalls that Mirtala the cook is being held downstairs in a chamber near a spiral staircase with frescos on the walls. The hobgoblins sent Sertanian away (perhaps a day ago; Sertanian has lost track of time), saying that the plump Mirtala will make a better meal.

Sertanian suspects that Kartenix is dead; he told Sertanian shortly after their capture that he was going to try to overpower the goblins guarding him by pretending to be asleep; immediately afterwards, they moved Kartenix, so Sertanian doesn’t know where he is.